Semi-indirect-lighting fixture.



H. C. ADAM.

SEMI-INDIRECT LIGHTING FIXTURE. APPLICATION mu) IAN. 24, ms.

1,178,201 Patented Apr. 4, lim- I J 0i nan-RY c. ADAM, OF ST. LOUIS, MISSOURI.

SEMI-INDIRECT-LIGHTING FIXTURE.

Specification of Letters Patent.

Patented A pr. 4., 1910.

Application filed January 24. 1916. Serial No. 73,962.

To all mil-0m may conflcrn lle it known that I. IIARRY C. Anni. a eitizen of the. lfni ed Htates, residing at St Louisultlissouri. hare invented a certainnew and useful Imprm'enient in Senir lndi' reet-Lighting Fixtures, off which the following is a full. clear, and exact description. such as will enable others skilled in the. art to which it appertains to make and use the aa ie.

This invention relates to semi-iinlirt-et lighting fixtures. and has for its: main ohjet-t to provide a seini indirect lighting fixture whit-h is so construeted that th rays; or light from the lighting unit will he dist trihufed in a novel manner that produces a b'll'flll lj li ht directly beneath the fixture and a diffused light on the ceiling from which the fixture is suspended.

.\nother object is to provide a 'enu-i!ulireet lighting: fixture in which the top re 'fleetor and the diffusing shield or hunt nn der the lighting unit are supported in a nmel manner which makes it. po l e to i l or l'tfllt 'v said tftt'lll t'lS quirk-fr and ea.- f .\nd -fill another ehivt in to pro \id a :letireof' nowl eonxtrurtion for deta hahly connecting the top reflector of a direct or sen|i-iiulirect lighting fixture to the supp rting Stt'ltftftf' that arrie mine.

other objects and deuirahle featurrs of inf. invention will he hereinafter pointed out.

Figure l of the draw lugs is an elemfi nal \iengpartfr hrolten away. of a lighting fi\' ture courtrurud in art'ordauee with til) iin Yention. Fig. '3 in a detail \iew. partfr in Vertie'l section. of the means used in the fixturt hown in Fig. l for supporting the top retlertor and the hot tom diffu-in; shield. and fig. 3 is a per pcrtiru '\l( of th rlip that forms part of Ftlltl flltzltlfi.

' Referring to the drawingx whit-h illus trate the preferred form of my intention. designates the top reflect r of' a Hllll lflill rect light ng fixture. l designates a translucent diffusing xhield or how! that i; ar ranged underneath aid top refleetor and 'lcsignafes the lighfing'unit of the fixture, herein Shown as an electriedanip hall). The. top l'('llt.('f()f',.\ is provided with two oppo- Sltei Y-ineliued'refleefing surf a es :r and that are arranged oeiween the nter edge of the top rrllet-for A and 2.1] opening 1 at he center of vaai i top reflector up through whirh a portion of the lighting unit (7 INLSHS. The reflecting surface .1. which in preferahl curred slightly slopes upwardfr from the outer edge of the top reflector l\. and merges into the reflecting surface 3/, whirh slopes upwardly from the eenfer opening-l in the top reflector, thereby proflti('lllf{ n reflecting surface on the top reflettof that ("arises the rays from the light in; unit to he projerted downu'ardfx' in hlft'll .a manner that a strong light is produ 't-d directly heneath the fixture. Some of the ru \'s froui the lighting; unit that s tril e the reflecting surface .1: on the top reflector are proiwted dow'nu'ardfr directly heneath the fixture and other raysthat strike the opmitelr int-lined reflerting surface 1 on the in reflertor are projt-eteu dounw'ardfv and laleralfr toward the .l(le walls of the room. Th upper edge of the difl'usilug- Slllfltl l3 i.\ arranged near enough to the top l'(.ll\'(ft*)l A to insure the rays that pass over the upper edge of the shield ll striking against the reflertin; surface .r on the top reflector, thus preventing an rays from the lighting nnit from escaping without sfrilting'either the :ddel l or the. top reflector.

The center opening 1 of the top reflector iullfllf. wine of the rays from the lighting unit to paw upwardly and illuminate the -pa 'e aho\e the top reflector A, and in ortlrr to prev nt these rays from producing an infenae fjltll't or hright ring; on the ceiling, directly ahow the top reflector. I have proided the fixture with a top diffusing shield l) arranged in such a manner that the rays pa ing upwardly through the center openin; l of the top reflector will be diffused, and than produce a soft light on the ceiling. 'l'hia top diffusing shield I) is formed of opafewrnt glass. or some other translucent ul: fa|u' and it is curved slightly in an are that i a proximately concentric with the filament of the lighting unit. so as to insure the upward rays passing directly through xanaimtead of' 'tXfl(lliQ' the. lllffltl'SHlO of the SlHtltl l) and glancing off at an angle.

'l'he top diffnsin; shield l) is preferably nnule considerably larger than the center opening I in the top refleetor, and the lower edge of said shield is arranged in entrant flftfll with or in close proxin'iity to the top side of the portion of the top reflector that surrounds the centeropening l inthe top reflector. By arranging the top diffusing shield D in this manner I eliminate the possibility of any upward rays from the lighting unit striking the ceiling, without first passing through a dill'using member, and I prevent dustand dirt from dropping through the center opening on the top reflector and collecting on the lighting unit.

In a lighting fixture of the construction above described practically all of the rays from the lighting unit are utilized and the rays are distributed in such a manner that a strong light is produced directly beneath the fixture and a soft, difl'used light is produced on the ceiling of the room in which the fixture is suspended. I realize that ithas long been the practice to arrange a lighting unit between an upper and a lower diffusing shield of translucent material, but my improved fixture is distinguished from a light ing fixture of the kind just referred to, in that it is composed of a top and a bottom diffusing shield arranged above and below the source of light, respectively, and a. top re-- flector arranged between said diffusing shields and provided adjacent its outer edge with an upwardly-inelined reflecting surface that projects the rays downwardly beneath the fixture, and adjacent its center with an oppositely-inclined reflecting surface that serves to project the rays downwardly and laterally toward the side walls of the room.

It is immaterial, so far as my broad idea is concerned, how the top reflector A and the top and bottom diffusing shieldsD and B are supported, but I prefer to connect the top diffusing shield D to a shell or husk 2 that incases an electric lamp socket 3 which carries the lighting unit C, said shell 2 being secured to a device that depends from the ceiling, such, for example, as a chain 4. The bottom diffusing shield B is suspended from short chains, links or rods 5 which are connected at their upper ends to a support ing structure that carries the top reflector A, said supporting structure preferably consisting of a plurality of chains or other suitable devices 6 that depend from the ceiling and which are provided at their lower ends with detachable clips E to which the top reflector A is clamped. The chains 6 that carry the top reflector and the bottom diffusing shield, and the center chain 4 that carries the shell 2 to which the top ditlusing shield is connected, have their upper ends secured to a canopy 7 on the ceiling, as shown in Fig. 1. Each of the clips E is substantially yokeshape'd, as shown in Fig. 3, and the cross piece 8 of same is provided with a,hole 9 for receiving the screw-threaded shank of a bolt 10 that clamps the clip to the top reflector A. The bolt 10 passes through an opening in the top reflector A and through the opening 9 in the cross piece of its cooperating clip, and a nut 11 is mounted on the shank of the bolt above said cross piece, as shown in Fig. "2, so as to draw the bolt upwardly, and thus securely clamp the top reflector A between the cross piece 8 of the clip and a head l2 on the bolt. At

the lower end of the bolt is an eye or ring through which the lower end portion of the chain link passes, the slot 15 in one of the side pieces of the clip extending in wardly from one edge of same and the slot 17 in the other side picre of the link tending inwardly from the opposite side. of the clip. as shown in Fig. 3. said slots 15 be ing provided at their inner ends with enlarged portions 15 so as to prevent the clip from twisting or turning with relation to the chain 6 to which it connected. T0 attach the clip to its cooperating chain G the bottom link of the chain is first inserted ,he tween the side pieces ll of the clip. and the link is then given a quarter turn, so that it will lie at right angles to the side pieces of the clip in the enlarged portions of the slots 15 in the clip. If desired, the side pieces of the clip can be cut away at 16 or provided with openings, as shown in Figs 2. and 3, so as to eliminate the possibility of the end of the shank of the bolt ll) bearing against the clip.

In assembling the fixture the clips E are first securely clamped to the top reflector A by means of the bolts 10, and the links at the lower ends of the chains 6 are then slipped into operative position in the cross slots of the clips. Thereafter, the bottom diffusing shield D is connected to the eyes or rings 13 onthe lower ends of the bolts 10 by means of the short links or chains 5 from which the bottom shield is suspended. The top diffusing shield D and the lighting unit (1 are both carried by a chain or other suitable device lthat is separate and distinct from the chains that support the top celled tor and the bottom diffusing shield, thus facilitating the installation of the fixture and the removal of same.

The clips E are preferably stamped out of sheet metal, and accordingly, they can be manufactured at a low cost. and as they can be connected to or disconnected from the chains 6 without inserting or removing scpa- 1" Having thus described my invention, what I claim, and desire to secure by Letters Patent, is: y

l. A lighting fixture, comprising a top reflector provided with oppositely-inclined reflecting surfaces and having a center opening up through which rays from the lightin unit of the fixture pass, a translucent di fusing shield arranged under said top reflector beneath the lighting unit, and a top diffusing shield of translucent material arranged over the center opening in the top reflector and curved on an arc that is approximately concentric with the source of light.

2. In a lighting fixture, a top reflector provided with a center opening and oppositely-inclined reflecting surfaces arranged intermediate said center opening and the outer edge of the reflector, a diffusing shield arranged underneath said top reflector, means for sustaining said top reflector and shield in operative position, a.

shell arranged abovethe top reflector and provided With a top difi'using shield of translucent material that extends over the center opening in the top reflector, an electric lamp socket carried by said shell, and a separate and distinct means for sustaining said shell in operative position.

3. In a lighting fixture, a top reflector, a supporting structure, and a yoke-shaped clip on the upper side of said top reflector whose side portions have horizontally-disposed slots for receiving an element on said supporting structure that is arranged at substantially right angles to the side portions of the clip.

4. In a lighting fixture, a top reflector, a chain from which said top reflector is sus* pended, and a yoke-shaped clip on the upper side of said top reflector whose side portions have horizontally-disposed slots that extend inwardly from opposite edges of the clip so as to permit the clip to be connected to one link of said chain by introducing the link between the side portions of the clip and then giving one of said elements a quarter turn with relation to the other.

5. In a lighting fixture, a top reflector, a supporting means, and a clip on the upper side of said top reflector for detachably conmeeting it to said supporting means, said clip consisting of a substantially yokeshaped device whose cross piece is provided with an opening for receiving a fastening device that connects the clip to the top reflector and whose side portions have horizontally-disposed slots that extend inwardly from opposite sides of the clip.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses,

this twenty-first day of January, 1916.

HARRY C. ADAM.

Witnesses:

WELLs L. CHURCH, GEORGE BAKEWELL. 

